engine work

[Teherr]

I am looking for someone to do some engine work on a 4/6 motor I have.  But it appears they used an invader sleeve which doesn't have the extra 2 transfer ports cut out.  I believe that someone who does porting work could open the extra port up. see pics. 

Any suggestions on who, what company would be best. 

[gixxer6]

I had a 4/6 cylinder with the same issue.  I took it to my local performance shop and they were able to open it up.  I had to give them the port measurements so they knew where and how much to cut.